Can someone please help me

62

Step-by-step explanation:

since the two sides are equal, that angles across it are also equal

all the angles add up to 180

180-56= 124

124/2= 62

proof: 62+62+56= 180

hope this helps!

20

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.